Sometimes they work and then the bulbs loose connection and go out. I have cleaned the points where the bulbs connect. They seem to make good contact. Often times just bumping the light will make them come on. What else can I do? Thanks

This doesn't sound like a grounding issue. Since that when the lights
are bumped they work. A grounding problem will result in both lights
blinking when the left or right turn signal is on. This sounds like bad
connections in the light bulb sockets. I have a trailer that does similar
things, when pulling it and hitting a bump, the light will fall out of
the socket. I am looking at getting different lights that have a socket
that the bulb goes into and has a 1/2 turn to keep it secure. I would
find different lights for your trailer.

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